Radioecological sensitivity represents the intensity of a region's global reaction to an accidental or chronic radioactive pollution. The prospects for an operational application of this concept are investigated by IRSN within the framework of the SENSIB project. The first aim of SENSIB is to represent globally the territorial consequences of a situation of radioactive contamination, which requires to collect and to investigate the radioecological and contextual data. For this purpose, varied innovative methods of knowledge treatment are investigated. The second objective is to elaborate a management tool of this knowledge which could be shared by various stakeholders (authorities, population, experts), and that is envisaged by the application of supporting methods to decision-making. The strategy, the preliminary results and the avenues of research of the project SENSIB are briefly presented.